RD Carbon Film Resistors Features: 1. Pure carbonhydric on ceramic cores. 2. Low cost. 3. Good quality and reliability. 4. Provide flameproof type, RDN.
RD Carbon Film Resistors
Products |
RD Carbon Film Resistors |
Features |
1. Pure carbonhydric on ceramic cores. 2. Low cost. 3. Good quality and reliability. 4. Provide flameproof type, RDN. |
Electrical And Mechanical Performance of RD Carbon Film Resistors:
Characteristics |
Standards |
Test Methods |
Resistance Tolerance |
±5%(J)or ±2%(G) |
- |
Resistance Temp. Coeff. |
0~-1300 ppm /°C |
-55°C ~ 155°C |
Power Rating Load |
Surface temp,235°C Max.△R/R≤±1% |
Rated voltage for 30 minutes |
Short Time Overload |
±1% |
2.5 times of rated valtage for 5 seconds. |
Dielectric Withstanding Voltage |
No evidence of mechanical damage or insulation breakdown.
|
Max. Overload Voltage for 1 min.( RDN 1 W & 2 W :AC 350V ) |
Insulation Resistance |
10,000MΩ |
DC 100V or 500V megger |
Terminal Strength |
No evidence of mechanical damage. |
< 1/4W : 1 kg > 1/2W : 1.5 kg |
Solder-ability |
Minimum95%coverage |
235±5°C for 2 seconds |
Resistance to Soldering Heat |
No evidence of mechanical damage.△R/R≤ ± 1 % |
270±5°C for 10 ±1 seconds 350±10°C for 3.5 ±0.5 seconds |
Environmental Characteristics of RD Carbon Film Resistors:
Characteristics |
Standards |
Test Methods |
Temp. Cycle |
△ R/R≤±1% |
-55°C( 30 min.) —► Room Temp.( 3 min.) —►+155°C(30 min.) —► Room Temp.( 3 min.)/( 5 cycles) |
Load Life |
△R/R≤±5% |
Rated power load 90 minutes ON 30 minutes OFF 70°C 1000 hours |
Moisture-proof Load Life |
△R/R≤±5% |
Rated power load 90 minutes ON 30 minutes OFF 40°C95%RH500 hours |
Nonflammability |
not flamed |
16 times of rated wattage for 5 min. |
Dimensions of RD Carbon Film Resistors:
Rated Wattage |
D±1 |
L±1 |
H±3 |
d±0.1 |
Resistance Range(Ω) |
Max. Working Voltage |
RD 1/8W, 1/6W(1/4WS) |
1.7±0.2 |
3.7max. |
28 |
0.45 |
3.9~4.7M |
200V |
RD 1/4W(1/2WS) |
2.4± 0.5 |
6.4 |
28 |
0.6 |
3.9~10M |
250V |
RD 1/2W |
3.5 |
9 |
28 |
0.65 |
3.9~10M |
350V |
RDN 1W |
4.5 |
11 |
28 |
0.8 |
3.9~10M |
500V |
RDN 2W |
5.0 |
15 |
28 |
0.8 |
3.9~10M |
750V |
Derating Curve of RD Carbon Film Resistors:
For resistors operated in ambient temperatures above 70°C ,power rating must be derated in accordance with the curve below.
Surface Temperature Rise of RD Carbon Film Resistors: